| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Yorktown Energy Partners XI, L.P. | 6.9% | 3,786,797 | 0 | 3,786,797 | /s/ Bryan H Lawrence | Managing Member of the general partner of the general partner | 0001667954 |
| Yorktown XI Company LP | 6.9% | 3,786,797 | 0 | 3,786,797 | /s/ Bryan H Lawrence | Managing Member of the general partner | |
| Yorktown XI Associates LLC | 6.9% | 3,786,797 | 0 | 3,786,797 | /s/ Bryan H Lawrence | Managing Member of the general partner |